Question

Ann
has
walked
8 km
with
a velocity
of
4 km/h.
Now
she
will
run
some
time
with
a velocity
of
8 km/h.
How
long
does
she
have
to
run
in
order
to
have
an
overall
average
velocity
of
5 km/h?

Answer 1

What is thissssssssss